[Vatari's Ritual Addiction, Permanent Fixes]
Smooth leather walls of overlaid straps with silver studs rise up around a dark haon floor. Dim sconces cast irregular shadows across the room, revealing a collection of haphazardly arranged tables. A curtain of dangling chains hangs along the backwall. You also see a silversteel pedestal with a couple of things on it, a large eye-searing yellow sign and a leather-covered door.
Obvious exits: none.

A large eye-searing yellow sign reads:

~Focus vs Foci: The Definitions~
It has come to my attention that you morons do not know the difference between 'focus' and 'foci.'
Allow me to provide some definitions even your simple minds should comprehend.
Focus - singular noun - an item used in ritual spells to increase the probability of a successful cast.
Usage: I purchased a focus from Vatari's shop.
Foci - plural noun - Multiple items used in ritual spells.
Usage: Vatari sells excellent foci that I should buy.